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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A361546 a(n) is the least odd number k such that k*2^prime(n) + 1 is prime, or -1 if no such number k exists.

Table of values

n a(n)
1 1
2 5
3 3
4 5
5 9
6 5
7 9
8 11
9 45
10 23
11 35
12 15
13 3
14 9
15 27
16 51
17 27
18 53
19 9
20 39
21 23
22 249
23 51
24 51
25 131
26 221
27 29
28 105
29 321
30 179
31 5
32 221
33 111
34 411
35 191
36 65
37 83
38 75
39 95
40 101
41 147
42 83
43 149
44 111
45 203
46 131
47 9
48 245
49 281
50 15
51 83
52 65
53 299
54 39
55 51
56 51
57 225
58 65
59 81
60 125
61 611
62 143
63 65
64 107
65 21

List of values

[1, 5, 3, 5, 9, 5, 9, 11, 45, 23, 35, 15, 3, 9, 27, 51, 27, 53, 9, 39, 23, 249, 51, 51, 131, 221, 29, 105, 321, 179, 5, 221, 111, 411, 191, 65, 83, 75, 95, 101, 147, 83, 149, 111, 203, 131, 9, 245, 281, 15, 83, 65, 299, 39, 51, 51, 225, 65, 81, 125, 611, 143, 65, 107, 21]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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